Ember model host adapter not overiding mirage - ember.js

Question

I'm using Ember-cli-mirage to mock data. I want to slowly integrate parts of the production api which is located on my local machine at http://localhost:8000. Ember docs tell me that I should be able to set an adapter so I can have a different host for each model.
I have a customer model, and have setup ember-cli-mirage which is successfully serving data. The customer model is the first model I want to split out to localhost:8000.
I've setup adapters/customer.js with the following:
import DS from 'ember-data';
export default DS.RESTAdapter.extend( {
host: 'http://localhost:8000',
namespace: 'api/v1'
});
But when I make the call I'm getting an error:
Mirage: Error: Your Ember app tried to GET 'http://localhost:8000/api/v1/customers',
but there was no route defined to handle this request.
Define a route that matches this path in your
mirage/config.js file. Did you forget to add your namespace?
And my header inspector shows that customers is making the request to the mirage server:
Request URL:http://localhost:6543/customers
Request Method:GET
Status Code:304 Not Modified
Remote Address:[::1]:6543
I suspect it's something to do with my config/environment.js setup so I'm looking at a variation of https://github.com/samselikoff/ember-cli-mirage/issues/497#issuecomment-183458721 as a potential workaround. But I can't see why mirage won't accept the adapter overide.

Answer 1

Should have read back through the mirage docs for this one. There's a passthrough function that allows mirage to pass certain requests through to Ember bypassing mirage:
// mirage/config.js
import Mirage from 'ember-cli-mirage';
export default function() {
this.urlPrefix = 'http://localhost:8000';
this.namespace = '/api/v1';
// Requests for customers
this.get('/customers');
this.get('/customers/:id');
this.post('/customers');
this.del('/customers/:id');
this.patch('/customers/:id');
// Passthrough to Django API
this.passthrough('/customers');
}
To make this work in my application adapter I added:
// app/adapters/application.js
import DS from 'ember-data';
export default DS.RESTAdapter.extend({
host: 'http://localhost:8000',
namespace: 'api/v1'
});
If this helps you in any way feel free to give this answer an upvote :)